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man pages section 3: Extended Library Functions, Volume 2

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Updated: Thursday, June 13, 2019
 
 

round(3M)

Name

round, roundf, roundl - round to nearest integer value in floating-point format

Synopsis

c99 [ flag... ] file... –lm [ library... ]
#include <math.h>

double round(double x);
float roundf(float x);
long double roundl(long double x);

Description

These functions round their argument to the nearest integer value in floating-point format, rounding halfway cases away from 0, regardless of the current rounding direction.

Return Values

Upon successful completion, these functions return the rounded integer value.

If x is NaN, a NaN is returned.

If x is ±0 or ± Inf, x is returned.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
Availability
system/library/math
MT-Level
MT-Safe
Standard

See Also

math.h(3HEAD), feclearexcept(3M), fetestexcept(3M), attributes(7), standards(7)